Well, what is the downside to having duplicate* questions? I would guess the vast majority of traffic to any specific question page is search, followed by spec

Well, what is the downside to having duplicate* questions? I would guess the vast majority of traffic to any specific question page is search, followed by specific links people have posted (on or offsite), and relatively little will come from browsing through lists of questions (tags pages) or something like that. Search is going to surface the most up-voted and linked questions. Links people have posted are obviously very specific (no chance of confusion following the link). I would say the upsides are that you end up with more opportunities to have nuanced differences in question handled, give more people a chance to answer questions, naturally refresh questions/answers over the years (eg: "How do I minify CSS in <stack>?" will have very different answers in 2019 than it did in 2009). * I'm not necessarily suggesting exact duplicates, but allowing for questions to be re-asked after a year or two, and allowing any subtle difference in the situation, stack, etc.